Magneto starting mechanism.



f L. JOHNSON.

MAGNETO STARTING MECHANISM.

APPLICATION FILED NOV-12.19M-

1,294,277. Patented Feb. 11,1919; IIIH' 'IIIIIIII' mu III UNITED STATES PATENT OFFICE.

LAN'GELOT JOHNSON, on ISLINGTON, LONDON, ENGLAND.

MAGNETO STARTING MECHANISM.

To all whom it may concern:

Be it known that I, LANCELOT JOHNSON,

a subject of the King of England, residing in Islington, London, in England, have in-, vented certain new and useful Improvements in. Magneto Starting Mechanism, of which the following is a specification.

This invention'relates to starting mecha-.

. nism for magnetos of internal-combustion vided which holds back one of the members,

so that the said relative angular movement can take place, and then is tripped so that the sliding member can advance under the action 1 of its spring and impart angular movement tothe magneto-spindle in the direction of the engine-drive.

Heretofore it has been necessary with devices: of. this kind to re-set the trippingmechanism at each operation or to hold it in one position by'a. separately operated part 7 which afterward had to be thrown out of action by the gear. A primary object of the present invention is to eliminate any separately-operated part, so-that'the whole be- .comes automatic, and to simplify, the mechanism. y

To this end, one-form of the improved starting mechanism comprises the slidable member, its cooperating member, and a stationary stop, in combination with a lever which is pivoted to one of these-membersto lock it againstfangular movement relative to the stop and is so placed as to be. auto:

matically tripped [by-the other member-when the engine-shaft vmember has been givena predetermined angular movement relatively to the magneto-spindle member.

1 Another object is to provide that theleverused as the trip-piece shall-be centrifugally controlled, so that afterbeing tripped it will (keep out of its locking position. i

Specification of Letters Patent. Patented Feb. 11, 1919." Application filed November 12, 1918. Serial No. 262,213.

To these and other ends, the, invention consists in the construction, arrangement and,

combination ofparts described hereinafter and pointed out in the claims.

One embodiment-of the invention is illustrated by way of example in the accompanying drawings, wherein Figure 1 is a plan ofthe starting mecha-';

mechanism-taken on the bent line 3-3 in Fig. 4 is an end elevationof the mechanism viewed from the engine shaft end and with the parts in the positionprionto tripp ev Like letters indicate like out the drawings.

The magneto-spindle A has fast upon it a cup-shaped member A the open side of which is toward the engine-shaft B, The edge of the cup-shaped member is shaped to provide a cam face A? with aapojcket A therein. Fast on the enginefshaft ,B 'is} an annular member B} which projects:into the cup-shaped member A and ha s [sliding upon it a sleeve or ring B which alsoenters the cup-shaped member A The ring B? is provided with splines 13 which slide in ceyways B in'the member B A spring C surrounds the member B and bears at one end against the ring B and at the other end against a flange on the member B This spring, therefore, always; tends to thrust the ring B? into th membe 'A ;..p.ro-

parts throughj'ecting laterally from-tliering ar e'p nscztr:

rying rollers B whichub'eai againstfthe"cam face A of the member A A Pivoted to theiexterior of the memberQA are levers D. These are pivoted to earsfDf about axes which lie at'right-angles toth'e axis of rotation of the engine-shaft and are so disposed that'the ends of the leversfcan move toward and away from the engineshaft. The levers haveshort arms project-' ing toward, the magneto which, lie in the path. of a stationary stop E when these arms are swung outward, and they have I,

longer arms'fon the engine side which ends I carry rollers D The rollers cooperate with ber B When thus started by the ring B lie in The stop E is carried by a post E which is a fixture relatively to the magneto casing, and at the front of the stop is a buffer spring The post E also carries a guard'E which is still farther in advance of the stop, so that when the parts are revolving it meets the levers before the guard is set so far in toward the levers that theshort arms of the same which engage. the stop E engaging position relatively to thestop if they should already be cut in the engaging position.

Two pins F are secured to the flange on the part B and project into the pockets A of themember A Theend of each pin F is shaped to form a flat spring and when the rollers B are in the pockets these flat ends bear against the approximately vertical faces A of the pockets A v The operation of this device is as follows:

\Vhen the engine-shaft- B is turned by hand the member B and consequently the ring B thereon is carried around with it. the rollers B carried the pockets A of the member A and as the camface A is steep, the rollers carry the member A around with them. The levers D are thus carried around with the member A and as either lever comes to the top, the long arm will drop down toward the engine-shaft and the short arm will be raised ready to engage the stop E. I'm passing under the guard E the raised arm is momentarily depressed for reasons hereinafter described, but the arm again rises before reaching the stop, blow and is thus stopped by the latter, the being eased by the buffer spring E This arrests further angular movement of the memberv A so that relative angular movement now takes place between this member and the engine-shaft member B Continued movement of the engine-shaft therefore causes the rollers 13 to ride up the camfaces A on the member A, whereby ring B is thrust back and the spring C is compressed. When the rollers reach approximately the the cams B on the flange of the member B arrive at the engine-shaft ends of the levers D, so that whichever lever is in con tact with the-stop E it'is disengaged there from by .the' cam thrusting the long arm outward, and the member A thus being released is suddenly advanced by the rollers B running down the cam-faces A into the pockets A The shock of the parts is absorbed by the springs F which arrest the angular movement of the member A by engaging the faces A and thus the endwise movethese reach the stop, and

are pushed into the nonthe tops of the cam-faces A and to slide arrested the bottoms of the pockets A but are prevented from doing so by the resilient action of/the springs F; that is to say, the springs F prevent the part A from moving around sufliciently far relatively to the ring B to allow the rollers 13* -to reach the bottoms of the pockets A and thus the relative angular movement of the parts and the relative endwi-se movement of the parts are both resiliently arrested.

If the engine has now of rotation causes the long arms of the levers D to fly out under centrifugal action, so that the short arms are now kept in and thus do not come into the stop E, and driving is effected by the engagement of the rollers B with the steep portions of the cam faces A", the rollers eing kept in the pockets by the thrust of the spring C. V

The object of the guard E -is to prevent the levers from coming against the stop E whenthe engine is running slowly. It insuresthat if the engaging arm of the lever should be in position for engaging the stop when passing vertically over the axis of rotation, this shall be thrust'in before reaching the stop and thus, if'the engine is running then at a slow speed, it will not have time to rise againbefore it has passed between-leaving the guard E -and reaching the stop E is such that the lever can again reach the engaging position. It will be noted also that the stop is not placed vertically above the axis of rotation of the engine-shaft, but over to one side of the same, so that the action of gravity shall not be so severe as would be the case if the stop were vertically above the said axis of rotation; this also operates toward the same end, namely guarding against the levers striking the stop when 'the engine is running slowly.

'VVhat I claim as my invention and desire ,to secure by Letters Patent is z 1. In magneto starting-mechanism of the type describec, the combination with an engine shaft, a magneto-shaft, a member fixed on one of said shafts, a spring-controlled member mounted to slide axially and to rotate relatively to the other shaf one of said members normallv'coacti ie a cam-face on the other and adapted to impart relatiye igular movement thereto the said spring-controlled member axially against the action of its spring, of a fixedstop, and a lever which is pivoted on one of said members, is adapted to react with and to be'ten'ipo-rarily by said stop to lock themember started, the speed contact with i ment re ativel to the sto and is adapted y. P:

to be automatically tripped by the other of said members when the engine-shaft has Y moved a predetermined angular distance relatively to the magneto-shaft.

2. In magneto starting-mechanism of the type described, the combination with an engine-shaft, a magneto-shaft, a member fixed on one of said shafts, a spring-controlled member mounted to slide axially on and to rotate about the other shaft, one of said members normally coacting with a cam-face on the other. and adapted to impart relative angular movement thereto and to slide the said spring-controlled member against the action of its spring, of a fixed stop, and a lever which is pivoted on the magneto-shaft member, is adapted to coact with and to be temporarily arrested by said stop to lock the magneto-shaft member against angular.

movement relatively to the stop, and is adapted to be automatically tripped by the engine-shaft member when the same has moved a predetermined angular distance relatively to the magneto-shaft member.

3. In magneto starting-mechanism of the type described, the combination with an engine-shaft, a. magneto-spindle in alinement therewith, a member fixed on the magnetospindle, a spring-controlled member mounted ,-to slideaxially' and to rotate relatively to the engine-shaft, one of said members normally'coacting with a cam-face on the other and adapted to impart relative angular movement thereto and to slide the said spring-controlled member axially against its spring and thereby loadthe latter, of a fixed stop, a cam fast on the engine-shaft, and a lever which is pivoted on one of said members and is adapted to coact with said cam and be automatically tripped thereby when the engine-shaft member has moved a predetermined angular distance relatively to the magneto-spindle member.

I. In magneto-startlng-mechanism of the type described, the combination with an en,

ginesshaft, a magento-spindle in alinement therewith, a member fixed on the magnetospindle, a spring-controlled member mounted to slide axially and to rotate relatively to the engine-shaft, one of said members normally coacting with a cam-face on the other and'being-adapted to impart relative angular movement thereto and to slide the,

said spring-controlled member axially rela tively toits spring, of a fixed stop, a cam fast on the engine-shaft, anda double-ended lever having arms of unequal length which is fulcrumed on the magneto-spindle member and has its shorter arm adapted to comb with and to be temporarilyarrested by said stop to lock the magneto-spindle member against angular movement relatively to the stop, the longer arm of they lever being adapted to coact with said cam to trip the lever from said stop 'when the engine-shaft member has moved a predetermined angular distancevrelatively to the magneto-spindle member.

5. In magneto starting-mechanism, the

combination of an engine-shaft, a magneto spindlein alinement therewith, a cup-shaped member having a cam-shaped edge fixed on the magneto-spindle, an annular member on the engine-shaft, a sleeve slidably splined on the annular member and entering into the cup-shaped member, said sleeve having radial projections arranged to coact with the cam-shaped edge of the latter, a spring arranged to tend to move said annular-member axially relativelyto said'sleeve, a fixe stop, and a lever which is pivoted' on the cup-shaped member, "is adapted to 'coact. with and to be temporarily arrested by said stop to lock the cup-shaped member against angular movement relatively to the stop, and is adapted to coact with said cam to be automatically tripped thereby to release the cupshaped member when'the said annular mem ber has moved a predetermined angular disto coact with and to'be tem 'iorarilv arrested by said stop to lock the membercarrying the same against. angular movement relatively to the stop, and is adapted to be automatically tripped bythe other of said members when the engine-shaft member has moved a predetermined angular distance relatively to themagneto-shaft member, and a flat spring which is carried by one of said members and projects therefrom in a line approximately parallel with the 'lii'ie 'of axial movement thereof and rpte d to engage a part of the other of ienibers to limit the relative angularnio-vcinenflot thesaid members after the lever has been tripped? 7. In ,magneto starting-mechanism, the combination ofan engine-shaft. a magnetospindle in alinement therewith, a cupshaped member havinga cam-shaped edge fixed on the magneto-spindle. an annular member having a cam on the periphery thereof fixed onthe engine-shaft, a sleeve slidably splined on the annular member and entering into the cup-shaped member, said sleeve havingradial projections arranged to having a cam on the periphery thereof fixed coact with the cam-shaped edge of the latter, a spring arranged to tend to move said annular member axially relatively to said sleeve, a fixed stop, a lever which is pivoted on the cup-shaped member, is adapted to coact with and to be temporarily arrested by said stop to lock the cup-shaped mem mr against angular movement relatively to the stop, andis adapted to coact with said cam to be automatically tripped thereby to release the cup-shaped member when the said annularmember has moved a predetermined angular distance relatively to the latter, and a fiat spring carried by said annular mem her and projecting into a recess in the said.

cam-shaped edge of the cup-shaped member in a direction approximately parallel with the axis of the engine-shaft.

8. In magneto starting-mechanism of the type described, the combination with an engine-shaft a magneto-spindle in alinement therewith, a member fixed on the magnetospindle', a spring controlled member mounted to slide axially and to rotate relatively to the engine-shaft, one of said members normally coacting with the cam-face on the other and adapted to impart relative angular movement thereto and to slide the said spring-controlled member axially relatively to its spring, of a fixed stop, a cam fast on the engine-shaft, a double-ended lever having arms of unequal length which is fulcrumed on the magneto-spindle memher and has its shorter arm adapted to coact with and to be temporarily arrested by said stop to lock the magneto-spindle member against relative angular movement relativelyto the stop, the longer arm of the lever adapted to coast with said cam to trip the lever from said stop when the engine-shaft member has moved a predetermined distance relatively to the magneto-spindle member, and a guard carried by-said stop and adapted to coact with the shorter arm of the lever when the same is at a small angular distance from the stop for forcing the same into its non-engaging position with the stop.

9. In magneto starting-mechanisnrof the type described,the combination with an en gine-shaft, a magneto-shaft, a member fixed on one of said'shafts, a spring-pressed mem ber mounted to slide axially on and to rotate about the other shaft, one of said members normally coacting with a cam fast on the otherand being adapted to impart rela- I tive angular movement thereto and to slide the said spring pressed member axially against its spring and thereby compress the latter, of a fixed stop, and a lever having arms of unequal length which is pivoted on one of said members, the shorter arm of the lever being normally adapted to coact with and to be temporarily arrested by said stop to lock the member carrying the same against angular movement relatively to the stop, the said lever being adapted to be automatically tripped by the other-of said members when the engineshaft moved a predetermined angular distance relatively to the magneto-shaft member, and being located approximately parallel to the axis of rotation of the engine-shaft and pivoted to rock about an axis at right-angles thereto and so dis-posed that the longer arm of the lever is adapted to swing away from the shaft under action of centrifugal force to place the shorter arm of the lever out of reach of said stop. v

' 10. In magneto starting-mechanismof the type described, the combination of an engine-shaft, a magneto-spindle in alinement therewith, a cup-shaped member having a cam-shaped edge fixed on the magnetospindle, a flanged annular member having a cam on the periphery thereof fixed on the engine-shaft, a ring slidably splined on'the annular member-and having radial projections normally coacting with the said camshaped edge, a compression spring arranged between the flange of the annular member and said ring, a fiat spring car ied by said flange and projecting into a recess in the said cam-shaped edge, a fixed stop, a-guard carried by the stop, and a double-ended lever, having a longer and a shorter arm,

which is fulcrumed on the cup-shaped mem' her and has its shorter arm adapted to coact with said guard and be forced into one extreme non-engaging position and thereafter to be temporarily arrested by said stop to lock the cup-shaped member against angular movement relatively to the stop, the said longer arm adapted to coact with said cam to trip the lever from said stop when the annular member has moved a predetermined (.listance relatively to the cup-shaped mem- In testimony whereof I aflix my signature.

LANCELOT JOHNSON.

.Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C.

i so

member has 7 

